<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>下拉菜单</title>
    <!--这个实例类似前面的实例，当我们在下拉列表中添加了链接，并设置了样式：-->
    <style>
        .dropbtn
        {
            background-color: #4CAF50;
            color: white;
            padding: 16px;
            font-size: 16px;
            border: none;
            cursor: pointer;
        }
        .dropdown
        {
            position: relative;
            display: inline-block;
        }
        .dropdown-content
        {
            display: none;
            position: absolute;
            background-color: #f9f9f9;
            min-width: 160px;
            box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
        }
        .dropdown-content a
        {
            color: black;
            padding: 12px 16px;
            text-decoration: none;
            display: block;
        }
        .dropdown-content a:hover{background-color: #f1f1f1;}
        .dropdown:hover .dropdown-content{display: block;}
        .dropdown:hover .dropbtn{background-color: #3e8e41;}
    </style>
</head>
<body>
<h2>下拉菜单</h2>
<p>鼠标移动到按钮上打开下拉菜单。</p>

<div class="dropdown">
    <button class="dropbtn">下拉菜单</button>
    <div class="dropdown-content">
        <a href="http://www.runoob.com">菜鸟教程1</a>
        <a href="http://www.runoob.com">菜鸟教程2</a>
        <a href="http://www.runoob.com">菜鸟教程3</a>
    </div>
</div>
</body>
</html>